Práticas de leitura e escrita em contexto acadêmico: relações (hiper)textuais singulares

The present article aims at reflecting about the discursive practices of writing and reading on the net, more specifically about the writing and reading methods used by the undergraduate and graduated teachers, based on an internet search engine. It’s of interest to investigate: i) the (hyper) textual relations established in the context thought as permitted by the electronic resources; ii) the discursive marks that arise (are arisen) in a singular way of reading (and/or writing). The set of material was produced during a university extension course about reading and cyberspace, whose context consisted of a drawing production of the reading process on an internet search engine, on the basis of the signifier “apple”. Based on the French Discourse Analysis and assumptions from the New Literacy Studies, we intended to discuss the operating procedures of the internet search and the effects of meanings produced by the subject during his/her reading/writing process.

Performance evaluation on electronic control systemsfor field sprayers using programmable logic controllers

The aim of this study was to develop a laboratory method for time response evaluation on electronically controlled spray equipment using Programmable Logic Controllers (PLCs). For that purpose, a PLC controlled digital drive inverter was set up to drive an asynchronous electric motor linked to a centrifugal pump on a experimental sprayer equipped with electronic flow control. The PLC was operated via RS232 serial communication from a PC computer. A user program was written to control de motor by adjusting the following system variables, all related to the motor speed: time stopped; ramp up and ramp down times, time running at a given constant speed and ramp down time to stop the motor. This set up was used in conjunction with a data acquisition system to perform laboratory tests with an electronically controlled sprayer. Time response for pressure stabilization was measured while changing the pump speed by +/-20%. The results showed that for a 0.2 s ramp time increasing the motor speed, as an example, an AgLogix Flow Control system (Midwest Technologies Inc.) took 22 s in average to readjust the pressure. When decreasing the motor speed, this time response was down to 8 s. General results also showed that this kind of methodology could make easier the definition of standards for tests on electronically controlled application equipment.

Taxonomic assessment and biotechnological potential of yeasts hold at the Unesp - Central for microbial resources

Pós-graduação em Ciências Biológicas (Microbiologia Aplicada) - IBRC